1296221 has 8 divisors (see below), whose sum is σ = 1358424. Its totient is φ = 1235520.

The previous prime is 1296209. The next prime is 1296227. The reversal of 1296221 is 1226921.

It can be written as a sum of positive squares in 4 ways, for example, as 784996 + 511225 = 886^2 + 715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1296221 is a prime.

It is a super-3 number, since 3×1296221³ = 6533688333937805583, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (169803).

2^1296221 is an apocalyptic number.

It is an amenable number.

1296221 is a deficient number, since it is larger than the sum of its proper divisors (62203).

1296221 is an equidigital number, since it uses as much as digits as its factorization.

1296221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751.

The product of its digits is 432, while the sum is 23.

The square root of 1296221 is about 1138.5170178790. The cubic root of 1296221 is about 109.0334324963.

The spelling of 1296221 in words is "one million, two hundred ninety-six thousand, two hundred twenty-one".